**"Area"**

## Grades 4 to 7 Two by Two Puzzle

*By toni On 25 August, 2018 · Leave a Comment*

Can you find numbers to replace the ? marks to solve this two by two multiplication puzzle? Can you explain how it works?

How does the diagram below connect with the multiplication?

Use the two grids to do the two multiplications:

72 × 25 […]

## Grades 11 and 12 Solve the triangle

*By toni On 18 August, 2018 · Leave a Comment*

The area of triangle PQR is 3√3 square centimetres. Angle PRQ is 60 degrees and RQ is 4 centimetres longer than PR.

Find the length of PQ.

Draw ΔPQR accurately.

Calculate all the angles in the triangle.

## Grades 5 to 8 Wholesome Rectangles

*By toni On 15 October, 2017 · Leave a Comment*

This activity is about rectangles with whole number dimensions. With other lengths and breadths there are infinitely many possible rectangles so here we just stick to whole numbers.

How many rectangles can you make with perimeter 12 units?

What do you know about rectangles? What is the smallest rectangle that you can […]

## Grades 9 to 11 Kissing Triangles

*By toni On 19 July, 2017 · Leave a Comment*

Find the total area of the two triangles by two different methods if ACD and BCE are straight lines .

What are the lengths PC and CQ?

The triangles are re-drawn keeping the total area the same and keeping the distances between the green parallel lines as 3 cm and BD = 4 cm.

## Grades 8 to 10 GRAPHICAL TRIANGLE

*By toni On 16 November, 2016 · Leave a Comment*

What is the area, (in square units) of the triangle formed by the three lines whose equations are: y − x = 6, x − 2y = 3 and x + y = 6?

This problem is adapted from the NRICH task Graphical Triangle with permission […]

## Grades 7 to 10 Painted Cube

*By toni On 5 November, 2016 · 22 Comments*

Imagine a large cube made up from 27 small red cubes each measuring 1 cm by 1 cm by 1 cm. What is its volume?

Imagine dipping the large cube into a pot of yellow paint so the whole outer surface is covered. What is its surface area?

Now imagine breaking the […]

## Grades 8 to 10 Riding on Pythagoras 1

*By toni On 3 November, 2016 · Leave a Comment*

1. Find the area of the quadrilateral.

2. The rectangle is cut into two pieces along the dotted line and rearranged to make a triangle. Find the perimeter of the triangle.

## Grades 8 to 10 Riding on Pythagoras 2

*By toni On 3 November, 2016 · Leave a Comment*

The diagram shows a septagon ABCDEFG in which the lengths GA, AB, BC, CD, DE, EF are all equal and FG = 6 units. The area of the square BDFG is half the area of the septagon. Find the perimeter of the septagon.

## Grade 9 or 10 – Enlargement

*By toni On 31 October, 2016 · Leave a Comment*

Make enlargements of the coloured shapes by fitting together four identical smaller shapes.

How much longer are the edges (the linear scale factor of the enlargement)?

How much bigger is the area (the area scale factor of the enlargement)?

Now look at the illustration of the 3-dimensional solids. One is […]

## Grades 7 to 9 Partitioning

*By toni On 23 October, 2016 · Leave a Comment*

Explain how the diagrams show how to work out 13 times 13 and (x+1) times (x+1).

Draw similar diagrams for 15 times 15 and (x+2) times (x+2).

Draw your own diagrams and use the same method to find the algebraic expressions for and and work out the expansion […]

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